Scaffold.



W. K. SAINT.

SCAFFOLD.

APPLICATION FILED OCT. 12.. 1917.

Patented July 9, 1918.

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WILLIAM KELSON SAINT, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

SGAFFO'LD.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed October 12, 1917. Serial No. 196,257.

7 '0 all whom it may concern:

Be it known that I, VVILLiAM KnLsoN SAINT, a subject of the King of Great Britain, and a resident of the city of Vancouver, in the Province of British Columbia, ada, have invented certain new and useful Improvements in Scafi'olds, of which the following is a specification.

My invention relates to improvements in scafiolds, and the object of my. invention is to provide a knock-down scaffold which is capable of being constructed of very light material so that it may be handled when set up withgreat ease and facility while at the same time possessing the necessary strength, rigidity, and safety required for the effective execution of any work in which it may be employed. A further object is to devise a scaffold of this nature which is adjustable as to height and length, which, when knocked down, may be folded up into a small compact parcel so that it may be readily carried by hand and transported in any public vehicle without causing inconvenience to the passengers therein, and which is simple in construction, enabling it to be manufactured and sold at a low cost.

I attain these objects by the construction illustrated in the accompanying drawings in which- Figure 1 is a perspective view of my scaffold when set up ready for use.

Fig. 2 is an end view.

Fig. 3 is an edge View of one of the platform boards.

Fig. 4: is a detail View of a supporting bar.

Similar figures of reference indicate similar parts throughout the several views.

Referring to the drawings, in which Fig. 1 shows the scaffold set up ready for use, 1 and 2 indicate the vertical end supporting frames of the device, which frames consist respectively of the vertical. legs 34 and 56, braced together at their lower ends by the inclined brace members 78 and 9-10 and the transversebraces 11 and 12. Pivotally connected to the legs 34 and 5-6 adjacent their lower ends are bracing members 1314 and 1516 capable of being swung to any desired angle and each of these members and also each of the vertical legs 34 and 56 is provided with a plurality of spaced openings 17 arranged oppositely in pairs, as shown in Fig. 1.

18 and 19 indicate removable boards forming the platform of the scafiold, which boards are supported attheir outer ends and also intermediate their length by rods 20, each of which rods is preferably provided with a split pin hole 26, as shown in Fig. 4,a11d is passed through a pair of openlngs 17 in the respective legs 3 4 and 6, and the bracing members 1314- and 1516, the rods also passing through staples 21 secured into the underside of the boards, as shown in Figs. 2 and 3. The boards are overlappedat their inner ends and are detachably secured to each other by means of clamps 22 and 23, as shown in Fig. 1, the end of board 18 being reinforced by a block 24 so, that a suitable bearing for the point of each clamp is provided.

25 indicates a rope permanently secured at oneend in any suitablemanner to the cross braces of the frame 1, its free end being passed around the cross braces of the frame 2 and, after being pulled taut, secured by a suitable knot, the tightening of which rope tends to pull the frames 1 and 2 together and stiffens the whole structure so that the weight of the operator on the platform, which is then slightly arched, is, in effect, taken up by the rope, which imparts an elasticity to the whole scaffold which would not otherwise be present and enables much lighter platform boards and general construction to be used than would be the case if the platform boards were rigidly sup-ported.

The adjustment of the platform as to height is efiected by raising or lowering the rods 20 in the openings 17, and as to length by moving the supporting frames and the boards 18 or 19 in or out to increase or decrease the lap of the boards.

To knock down the scaffold the clamps 22 and 23 are removed, the rods 20 withdrawn, and the boards 18 and 19 lifted off, the rope 25 having first of all been untied. If it is desired to pack it up to be stowed away or to be carried or shipped from one place to another, the supporting members 131 1 and 1516 are folded on their respective frames 1 and 2 and the two frames are then laid one on the other after the two boards 18 and 19 have been laid therebetween. The rope 25 is passed around the whole in a suitable manner and pulled taut and knotted securely, thus maintaining the entire knocked down scafi'old in a neat and compact parcel.

From the foregoing it will be seen that l have devised a simple and inexpensive knock down scafi'old which is possessed of great supporting strength, rigidity, and safety, While at the same time it 15 capable of being constructed of very light material,

and Which provides a great convenience not only for tradesnien such as painters, paper hangers, plasterers, and like, but also in households, as it is capable of'being used wi h greet dven eeein Place of the Q idi na y tep add What I claim as my invention is:

In. e se field e Pla rm; v r-l iee S p P ing r m s the et, h e ri et b sa d rame e d engagilig th ple ierm' b twe n the 'f eme d7 a fiekible eere e ien b we n said [s ed p i b drer' i a t d P 111 h b te fiL Ie-i s 1.1 fl me t l Wed e h'ether wher by an ete ingstrain is. ex ted n 1 119 P l P QII lJ f 2 1m ee e eter i 9i. re -mea 1119:- Perting fr mese ple fieifm board for web me SuPP t thereby t'il s Out id' a d etaehebly seeu edit-he et a t out r end, h nn r ends or Seidbe rds being apped end d iies 'e ly "el m ed It g fihe e s for bree n 'seid ee d i term d he l ngth, an e flex ble le ne ltien lee W e n said rames adap ed te le her e est o e 1 9 paused fram tw ed e' he h ierm boardsto stiffen the platiorm med thereby.

3. In a scaffold, a pair of vertical supporting frames the opposite legs of which are'suitably braced together and provided ,With plurality o f vertically spaced openings and a rod passing through a pair of said openings, a platform board for each frame each of which is supported on the said rods at its outerend, the" inner ends of said boards being clamped together, a pair of v bracing frames hipgedly connected at their lower ends to the respective vertical frames l and having their opposite legs perforated With a plurality ofspaced cop eningsand pro- W 1 w h e redpe 'se 'th eugh a p of said openings, said hinged frames being disposed "so mature "of the same support he said p tf m beards app oximate y in medies 1 h ii" en fihy P1 en h ndersid 9f sa ea d and threug which he said eds Pa s, an an a ju ab e0 neetien be we n the lew 'e d 6f s d ertical frarnes wherebytension can be exerted pon the P at m to erelh Deed a Veneeiu en. B, hi 26t ey of September, 1917.

' WlL IAM KEL N INT cents each, by addressing the cpmn 'gssio rer new, r I 

